Persistent Ion Accumulation at Interfaces Improves the Performance of Perovskite Solar Cells
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
The mixed ionic-electronic nature of lead halide perovskites makes their performance in solar cells complex in nature. Ion migration is often associated with negative impacts─such as hysteresis or device degradation─leading to significant efforts to suppress ionic movement in perovskite solar cells. In this work, we demonstrate that ion trapping at the perovskite/electron transport layer interface induces band bending, thus increasing the built-in potential and open-circuit voltage of the device. Quantum chemical calculations reveal that iodine interstitials are stabilized at that interface, effectively trapping them at a remarkably high density of ∼1021 cm-3 which causes the band bending. Despite the presence of this high density of ionic defects, the electronic structure calculations show no sub-band-gap states (electronic traps) are formed due to a pronounced perovskite lattice reorganization. Our work demonstrates that ionic traps can have a positive impact on device performance of perovskite solar cells.
Details
Originalsprache | Englisch |
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Seiten (von - bis) | 3302-3310 |
Seitenumfang | 9 |
Fachzeitschrift | ACS energy letters |
Jahrgang | 7 |
Ausgabenummer | 10 |
Publikationsstatus | Veröffentlicht - 14 Okt. 2022 |
Peer-Review-Status | Ja |